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A Study on the Diversity and Habitat Specificity of Macrofungi of Assam, India

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A Study on the Diversity and Habitat Specificity of Macrofungi of Assam, India Int.J.Curr.Microbiol.App.Sci (2017) 6(12): 275-297 International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 6 Number 12 (2017) pp. 275-297 Journal homepage: http://www.ijcmas.com Original Research Article https://doi.org/10.20546/ijcmas.2017.612.034 A Study on the Diversity and Habitat Specificity of Macrofungi of Assam, India Assma Parveen, Lipika Khataniar, Gunajit Goswami, Dibya Jyoti Hazarika, Pompi Das, Trishnamoni Gautom, Madhumita Barooah and Robin Chandra Boro* Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat-13, India *Corresponding author ABSTRACT Studies on the taxonomy and diversity of macrofungi have gained significance during the recent years, as many macrofungi are facing the risk of extinction because of habitat K e yw or ds destruction. We report, here a systematic and detailed study on the diversity and distribution of wild mushrooms in the state of Assam, India, based on phenotypic and Macrofungi, Diversity, Wild- molecular characteristics. A total 44 samples were collected from various locations of edible, Assam in different seasons during 2013-2015. Out of the total 44 samples, about 18 Morphological macrofungi species occurred during summer season, 9 species were recorded during rainy, study, ITS. 13 species were frequently found during autumn, 5 species in winter and 8 species were prominent during spring. The soil was found as major habitat for 18 collected species, Article Info while 10 species were collected from the tree/hardwood tree. This study indicated that the Accepted: diversity and distribution of macrofungi are dependent on the plant community and the 04 October 2017 environmental conditions. Molecular characterization based on rDNA -ITS- ((Internal Available Online: transcribed spacer) sequences revealed that the 44 samples belonged to 16 macrofungal 10 December 2017 families. Out of the 44 samples, 23 samples were reported to be edible and amongst the rest 21 non-edible strains, 5 strains have medicinal properties, 6 strains are poisonous, two has industrial application and the rest have not been fully explored. Introduction Fungi play a significant role in industry, Zygomycota) (Alexopoulus et al., 2000). agriculture, medicine, food industry, textiles, Macrofungi are found in varied types of and bioremediation (Danielson et al., 1989; habitats, depending on the composition of tree Manzi et al., 1999; Krzywinski et al., 2009; species and other substrates. The distribution Changet al., 2004). Fungi can be broadly of macrofungal species is low in hot and dry classified into three different forms viz., seasons while they are abundant in spring and yeast, moulds and macrofungi or mushrooms. autumn due to favourable climate and Macrofungi are large, conspicuous spore- abundance of flora during that time (Pilz et bearing structures and have fleshy, tough al., 2001). Similar to yeast and moulds, umbrella like sporophores that bear macrofungi also possess immense biological holobasidia on the surface of gills or lamellae and economic impact since they serve as that hang down from the cap belonging to food, medicine, biocontrol agents and produce basidiomycetes and ascomycetes (few under of bioactive compounds such as anti-oxidant, 275 Int.J.Curr.Microbiol.App.Sci (2017) 6(12): 275-297 anti-diabetic, hypocholesterolemic, anti- potential. Therefore, it is crucial to document tumor, anti-cancer, immunomodulatory, anti- the diversity, distribution and abundance of allergic, nephroprotective, and anti-microbial these macrofungi in Assam. Such study will agents (Patel et al., 2012). Macrofungi are not only pave the way towards domestication used in the bioremediation of industrial waste and commercialization of the wild species for and in the accumulation of heavy metals from economic benefits but will also help in the environment (Tuli et al., 2013). There are establishing a strong basis for molecular about 2166 worldwide recognized edible taxonomy. In this study we aimed to collect species that include about 470 species macrofungi from different habitats of Assam possessing medicinal properties. Furthermore, followed by their taxonomic evaluation using macrofungi are useful indicators of health or phenotypic and molecular characteristics. age of an ecosystem (Boa et al., 2004). Materials and Methods Assam, situated in the Northeast of India is a constituent unit of the Eastern Himalayan Collection of macrofungi Biodiversity Region; one of the two biodiversity “Hot Spots” in the country. The Systematic and periodical survey of different climatic conditions along with varied physical forests, tea gardens and other habitats were features in Assam, makes it rich in diversity undertaken during November, 2013 to April, of ecological habitats such as forests, 2015. For this study, the opportunistic grasslands, wetlands, which harbour and sampling of macrofungi protocol, was sustain wide range of floral and faunal followed (Mueller et al., 2004). The sampling species. Assam has a sub-tropical monsoon method involved walking throughout the climate with an average rainfall of around entire study region and collecting the 1,500 mm per year. The day-time temperature macrofungi covering up to 80% of the area. in summer, the rainy season, rises to around Sampling of the ground-dwelling macrofungi 35ºC and in winter cools to 25ºC with a night involved careful extraction of the fruit body time minimum of around 10ºC which is from the soil and leaf litter, ensuring that the favorsthe growth of most of the macrofungal basal surface was intact. The tree-dwelling species (Das et al., 2005). Although, macrofungi were sampled by cutting off the macrofungi are good resources for agro- basidiomata from the trees without disturbing industrial, medicinal (Veena et al., 2012) and the spore surfaces present below. Different commercial purposes, very few studies have species exhibit different fruiting phenologies, reported the macrofungal diversity of which vary from month to month and at Northeast India (Khaund and Joshi, different altitudes and regions. 2014). Several varieties of macrofungi are being consumed by the local tribes of Assam The survey and collection of mushroom was which are harvested from wild habitats but no done from different locations of Assam viz. efforts have been made to cultivate these Nalbari, Barpeta, Jorhat, Sibasagar, Karbi macrofungi for commercial production. Anglong, Kamrup, Golaghat, Goalpara, Moreover, there are no scientific reports Tezpur, Tinsukia, Rangia and Nagaon under related to characteristics of the wild edible different agro-climatic conditions, during the macrofungi which are slowly disappearing year 2013-2015. The macrofungal samples due to habitat loss. Because of these reasons, were collected in different seasons of the the farmers and entrepreneurs of Assam have year; rainy season (July and August), winter not been able to exploit its agro-economic (December and January), spring (March and 276 Int.J.Curr.Microbiol.App.Sci (2017) 6(12): 275-297 April) and summer (May and June) during polymerase protocol (Takara, Japan) with 20 2013-15. Soft macrofungi were collected pmols of each primer, 2U Taq DNA carefully by using forceps/free hand, while polymerase and 50 ng genomic DNA in a the macrofungi growing on wood were final volume of 50 μL and amplification was collected along with small part of wood. All performed using a thermal cycler (Applied collected samples were carefully wrapped in Biosystems, USA). The PCR program was as aluminum foil, placed in an air-tight zip-lock follows: initial denaturing step of 94°C for 3 bag and labeled with the collection number, min, followed by 35 cycles of denaturation at location, date, and other data. The photograph 94°C for 30 sec, annealing at 49°C for 1 min of the mushroom was taken in their natural and elongation at 72°C for 1 min; a final habitat. extension step at 72°C for 7 min. The amplified products were sequenced as per the Morphological characterization BigDye Terminator sequencing protocol in an ABI 377 automated DNA Sequencer (Applied Morphological characterization of the Biosystems, USA). The ITS rDNA sequence macrofungal strains were carried out based on reads obtained after sequencing were the cap size, cap structure, colour of the assembled into contig using CodonCode fruiting body, dimensions of stipe, gill shape Aligner (CodonCode Corporation, USA). and gill colour as described earlier (Kumar et Sequence similarity tool BLAST was al., 2015). Further, the fresh sporocarps of employed to find the similarity of the mushroom species were cultured to obtain sequences with known 16S rDNA sequences vegetative mycelium from the tissue (small in the GenBank database and the sequences pieces cut from section between the pileus were deposited in GenBank of NCBI to obtain and stipe) using Potato Dextrose Agar (PDA) the accession numbers. Phylogenetic analysis media and incubated at 25 ± 2°C. of the isolates was carried out based on ITS- rDNA sequences in MEGA6 software Molecular characterization and (Tamura et al., 2013). A phylogenetic tree phylogenetic analysis of the macrofungal was constructed using the ITS-rDNA strains sequences of the macrofungal strains along with other similar or related macrofungal ITS- For Molecular characterization of the 44 rDNA sequences retrieved from the NCBI macrofungal isolates were performed by GenBank. The sequences were aligned with sequencing the rDNA internal transcribed Clustal W using default parameters and a spacer (ITS) region.
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